DEPA Air Driven Diaphragm Pumps Series M Type DL Cast Metal Pumps All models are completely self contai- ned, only requiring connection to pipework and air supply. Standard design Features include maintenance free control valve, stainless steel base with integral anti vibration mounts, drain and vent connections, stainless steel clamp bands, air intake filter (for DL25 to DL80) and muffler. Accessories A complete range of accessories simplifies operation and enhances flexibility. They include pulsation dampeners, monitoring and control systems, various transport devices, quick release couplings, adapters etc. For more information, please contact your local supplier. ■ Ideal for abrasive, viscous and shear sensitive media, and for products with entrained solids. ■ Tolerance of dry running and harsh usage. ■ Minimal maintenance with no lubrication required. ■ Posivive displacement pumping action minimises product shear. ■ Completely enclosed units with no bearings or rotary seals in the product stream. ■ Air operation means suitability for explosive or hazardous areas. ■ Easy control of flow rate by regulating air supply. ■ No need for electric motors, special drives or base plates. ■ Easily portable and ready to use by simply connecting to air supply. ■ Can be run against a closed dis- charge—a vital benefit for use on filling machines. ■ Self priming and submersible. ■ Rugged construction in cast aluminium, ductile iron or cast stainless steel. For general industrial, water/ waste, construction and mining duties. Many years experience in the design and manufacture of air driven dia- phragm pumps have resulted in these high performance units. Because of their compact, lightweight construc- tion, they are well suited to portable and mobile applications as well as fixed installation in process plants. All types of fluids from water to slur- ries and pastes, including abrasive or shear sensitive media containing solids, are handled cost effectively by these pumps. Choice of just the right Series M unit to satisfy the requirement in each case is facilitated by availability of three different materials for the pump housing: * Cast Aluminium, AL 233 * Ductile Iron, GGG 40 * Cast Stainless Steel, 1.4408 (SS 316) Series M pumps are manufactured in five different sizes with standard connections: DN 15 to DN 80, ( 1 /2 in. to 3 in.)
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DEPA Air Driven Diaphragm PumpsSeries M Type DLCast Metal Pumps
All models are completely self contai-ned, only requiring connection topipework and air supply.
Standard design
Features include maintenance freecontrol valve, stainless steel base withintegral anti vibration mounts, drainand vent connections, stainless steelclamp bands, air intake filter (for DL25to DL80) and muffler.
Accessories
A complete range of accessoriessimplifies operation and enhancesflexibility.
They include pulsation dampeners,monitoring and control systems,various transport devices, quickrelease couplings, adapters etc.
For more information, please contactyour local supplier.
■ Ideal for abrasive, viscous andshear sensitive media, and forproducts with entrained solids.
■ Tolerance of dry running andharsh usage.
■ Minimal maintenance with nolubrication required.
■ Completely enclosed units withno bearings or rotary seals in theproduct stream.
■ Air operation means suitability forexplosive or hazardous areas.
■ Easy control of flow rate byregulating air supply.
■ No need for electric motors,special drives or base plates.
■ Easily portable and ready to useby simply connecting to airsupply.
■ Can be run against a closed dis-charge—a vital benefit for use onfilling machines.
■ Self priming and submersible.
■ Rugged construction in castaluminium, ductile iron or caststainless steel.
For general industrial, water/waste, construction and miningduties.
Many years experience in the designand manufacture of air driven dia-phragm pumps have resulted in thesehigh performance units. Because oftheir compact, lightweight construc-tion, they are well suited to portableand mobile applications as well asfixed installation in process plants.
All types of fluids from water to slur-ries and pastes, including abrasive orshear sensitive media containingsolids, are handled cost effectively bythese pumps.
Choice of just the right Series M unitto satisfy the requirement in eachcase is facilitated by availability ofthree different materials for the pumphousing:
Series M pumps are manufactured infive different sizes with standardconnections: DN 15 to DN 80,(1⁄2 in. to 3 in.)
DEPA Air Driven Diaphragm Pumps
Double acting, positive displacementSeries M pumps operate with twoalternating pumping chambers. Thecompressed air which drives the unitis admitted through a control valve, tothe rear of each diaphragm in turn, sodisplacing the medium from alternatepumping chambers.
In the pump illustrated, the right handpumping chamber is in the intakeposition. A vacuum has been created
by the retraction of the diaphragmand the pumped medium flows intothe chamber. The left hand dia-phragm, which is supported by com-pressed air, simultaneously displacesthe medium present in this chamber.
Since the two diaphragms are conn-ected by a common piston rod,suction always occurs in one cham-ber whilst discharge is occurring inthe other.
Series M Type DL Operating Principle
Materials of construction available as standard series
NRS B B BNBR (Buna N) N N NEPDM (Nordel) E E EEPDM (High press.) D – –EPDM (grey) G – GFKM (Viton) F F –PTFE (Teflon) T T TCeramic 1) – – KEPDM greyfor Type DH U – –PTFE for Type DH P – –Stainless steel – – RNBR, steel core – – YEPDM, steel core – – WEPDM, grey withsteel core – – XPTFE, steel core – – ZConical valve, EPDM – E I
% Example: During the conveyance of a product with aviscosity of 6000 mPa · s, the pumping rate decresesto 60 percent of the rated value,based on water.
Decrease in pumping rate for viscous liquids
Performance characteristics of Series M Type DL cast metal models
3
Example: With a suction lift of 4 mWC,the pumping rate decreases by about20%. This figure varies with differentpump configurations.
0 2 4 6 8 10 mWC
Suction head
Dec
reas
e in
pum
pin
g ra
te 80
60
40
20
0
% Decrease in pumping rate for specified suction lift
Example: To help you select the correct pump sizeRequired pumping rate is 17 m3/h and required total discharge head is20m. The correct selection is DL 50, the required air pressure is 3.8 barand the air consumption is 1.5 Nm3/min.
Extremely rugged constructionreduces downtime to a minimum.
DEPA pumps have been designed insuch a way that all components incontact with the product can be dis-assembled and reassembled within afew minutes. This means that servicingwork is reduced to the absolute mini-mum.
DEPA air driven diaphragm pumpshave been developed as a modularsystem. Consequently, many compo-nents—some of which are common toall versions—are mutually compatibleand interchangeable.
This flexible construction allows quickand simple changing of the internalsfor all Type DL models, to fulfil differentapplications.
Discharge
Air connection
Suction
Leafl
et N
o 6
421
4/
00
All information published here is subject to change without notice.
There is a DEPA diaphragm pumpfor practically every liquid thatflows.DEPA air driven diaphragm pumps areavailable in three different basic con-
structions: cast metal, solid plasticand highly polished stainless steel(CIP compatible). Special purposedesigned models are available forpowders, high pressures up to 21 bar
and drum pumping of hard-to-handledrum contents.
For more information please contactyour local supplier.